package com.xuecheng.media.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.j256.simplemagic.ContentInfo;
import com.j256.simplemagic.ContentInfoUtil;
import com.xuecheng.base.exception.XueChengPlusException;
import com.xuecheng.base.model.PageParams;
import com.xuecheng.base.model.PageResult;
import com.xuecheng.base.model.RestResponse;
import com.xuecheng.base.utils.StringUtil;
import com.xuecheng.media.mapper.MediaFilesMapper;
import com.xuecheng.media.mapper.MediaProcessMapper;
import com.xuecheng.media.model.dto.QueryMediaParamsDto;
import com.xuecheng.media.model.dto.UploadFileParamsDto;
import com.xuecheng.media.model.dto.UploadFileResultDto;
import com.xuecheng.media.model.po.MediaFiles;
import com.xuecheng.media.model.po.MediaProcess;
import com.xuecheng.media.service.MediaFileService;
import io.minio.*;
import io.minio.messages.DeleteError;
import io.minio.messages.DeleteObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.*;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @description TODO
 * @author Mr.M
 * @date 2022/9/10 8:58
 * @version 1.0
 */
 @Service
 @Slf4j
public class MediaFileServiceImpl implements MediaFileService {

  @Autowired
 MediaFilesMapper mediaFilesMapper;
  @Autowired
 MinioClient minioClient;
  @Autowired
  MediaFileService mediaFileService;
  @Autowired
 MediaProcessMapper mediaProcessMapper;

 @Override
 public MediaFiles getFileById(String mediaId) {
  MediaFiles mediaFiles=mediaFilesMapper.selectById(mediaId);
  return mediaFiles;
 }

 @Override
 public PageResult<MediaFiles> queryMediaFiels(Long companyId,PageParams pageParams, QueryMediaParamsDto queryMediaParamsDto) {

  //构建查询条件对象
  LambdaQueryWrapper<MediaFiles> queryWrapper = new LambdaQueryWrapper<>();
  
  //分页对象
  Page<MediaFiles> page = new Page<>(pageParams.getPageNo(), pageParams.getPageSize());
  // 查询数据内容获得结果
  Page<MediaFiles> pageResult = mediaFilesMapper.selectPage(page, queryWrapper);
  // 获取数据列表
  List<MediaFiles> list = pageResult.getRecords();
  // 获取数据总数
  long total = pageResult.getTotal();
  // 构建结果集
  PageResult<MediaFiles> mediaListResult = new PageResult<>(list, total, pageParams.getPageNo(), pageParams.getPageSize());
  return mediaListResult;

 }
 private String getMimeType(String extension){
  if(extension==null)
   extension = "";
  //根据扩展名取出mimeType
  ContentInfo extensionMatch = ContentInfoUtil.findExtensionMatch(extension);
  //通用mimeType，字节流
  String mimeType = MediaType.APPLICATION_OCTET_STREAM_VALUE;
  if(extensionMatch!=null){
   mimeType = extensionMatch.getMimeType();
  }
  return mimeType;
 }
 //获取文件默认存储目录路径 年/月/日
 private String getDefaultFolderPath() {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  String folder = sdf.format(new Date()).replace("-", "/")+"/";
  return folder;
 }
 //获取文件的md5
 private String getFileMd5(File file) {
  try (FileInputStream fileInputStream = new FileInputStream(file)) {
   String fileMd5 = DigestUtils.md5Hex(fileInputStream);
   return fileMd5;
  } catch (Exception e) {
   e.printStackTrace();
   return null;
  }
 }
 /**
  *
  * @param localFilePath 文件本地路径
  * @param mimeType 媒体类型
  * @param bucket 桶
  * @param objectName 对象名
  * @return
  */
 public boolean addMediaFilesToMinIO(String localFilePath,String mimeType,String bucket, String objectName) {
  try{
   UploadObjectArgs uploadObjectArgs= UploadObjectArgs.builder()
           .bucket(bucket)
           .object(objectName)
           .filename(localFilePath)
           .contentType(mimeType)
           .build();
   //上传文件
   minioClient.uploadObject(uploadObjectArgs);
   return true;
  } catch (Exception e){
   e.printStackTrace();
   log.error("上传文件出错,bucket:{},objectName:{},错误信息:{}",bucket,objectName,e.getMessage());
  }
  return false;
 }

 private void addWaitingTask(MediaFiles mediaFiles){
  //文件名称
  String filename = mediaFiles.getFilename();
  //文件扩展名
  String extension = filename.substring(filename.lastIndexOf("."));
  //获取文件的mimeType
  String mimeType = getMimeType(extension);
  if(mimeType.equals("video/x-msvideo")){
   MediaProcess mediaProcess=new MediaProcess();
   BeanUtils.copyProperties(mediaFiles,mediaProcess);
   //状态是未处理
   mediaProcess.setStatus("1");
   mediaProcess.setCreateDate(LocalDateTime.now());
   mediaProcess.setFailCount(0);//失败次数默认为0
   mediaProcess.setUrl(null);
   mediaProcessMapper.insert(mediaProcess);
  }
 }
 /**
  * @description 将文件信息添加到文件表
  * @param companyId  机构id
  * @param fileMd5  文件md5值
  * @param uploadFileParamsDto  上传文件的信息
  * @param bucket  桶
  * @param objectName 对象名称
  * @return com.xuecheng.media.model.po.MediaFiles
  * @author Mr.M
  * @date 2022/10/12 21:22
  */
 @Transactional
 public MediaFiles addMediaFilesToDb(Long companyId,String fileMd5,UploadFileParamsDto uploadFileParamsDto,String bucket,String objectName){
  //从数据库查询文件
  MediaFiles mediaFiles = mediaFilesMapper.selectById(fileMd5);
  if (mediaFiles == null) {
   mediaFiles = new MediaFiles();
   //拷贝基本信息
   BeanUtils.copyProperties(uploadFileParamsDto, mediaFiles);
   mediaFiles.setId(fileMd5);
   mediaFiles.setFileId(fileMd5);
   mediaFiles.setCompanyId(companyId);
   mediaFiles.setUrl("/" + bucket + "/" + objectName);
   mediaFiles.setBucket(bucket);
   mediaFiles.setFilePath(objectName);
   mediaFiles.setCreateDate(LocalDateTime.now());
   mediaFiles.setAuditStatus("002003");
   mediaFiles.setStatus("1");
   //保存文件信息到文件表
   int insert = mediaFilesMapper.insert(mediaFiles);
   if (insert < 0) {
    log.error("保存文件信息到数据库失败,{}",mediaFiles.toString());
    XueChengPlusException.cast("保存文件信息失败");
   }
   log.debug("保存文件信息到数据库成功,{}",mediaFiles.toString());
  }
  addWaitingTask(mediaFiles);
  return mediaFiles;

 }
 /**
  * 得到合并后的文件的地址
  * @param fileMd5 文件id即md5值
  * @param fileExt 文件扩展名
  * @return
  */
 private String getFilePathByMd5(String fileMd5,String fileExt){
  return   fileMd5.substring(0,1) + "/" + fileMd5.substring(1,2) + "/" + fileMd5 + "/" +fileMd5 +fileExt;
 }
 /**
  * 从minio下载文件
  * @param bucket 桶
  * @param objectName 对象名称
  * @return 下载后的文件
  */
 public File downloadFileFromMinIO(String bucket,String objectName){
  //临时文件
  File minioFile = null;
  FileOutputStream outputStream = null;
  try{
   InputStream stream = minioClient.getObject(GetObjectArgs.builder()
           .bucket(bucket)
           .object(objectName)
           .build());
   //创建临时文件
   minioFile=File.createTempFile("minio", ".merge");
   outputStream = new FileOutputStream(minioFile);
   IOUtils.copy(stream,outputStream);
   return minioFile;
  } catch (Exception e) {
   e.printStackTrace();
  }finally {
   if(outputStream!=null){
    try {
     outputStream.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }
  return null;
 }
 /**
  * 清除分块文件
  * @param chunkFileFolderPath 分块文件路径
  * @param chunkTotal 分块文件总数
  */
 private void clearChunkFiles(String chunkFileFolderPath,int chunkTotal){
  Iterable<DeleteObject> objects =  Stream.iterate(0, i -> ++i).limit(chunkTotal).map(i -> new DeleteObject(chunkFileFolderPath+ i)).collect(Collectors.toList());;
  RemoveObjectsArgs removeObjectsArgs = RemoveObjectsArgs.builder().bucket(bucket_video).objects(objects).build();
  Iterable<Result<DeleteError>> results = minioClient.removeObjects(removeObjectsArgs);
  //要想真正删除
  results.forEach(f->{
   try {
    DeleteError deleteError = f.get();
   } catch (Exception e) {
    e.printStackTrace();
   }
  });

 }


 @Value("${minio.bucket.files}")
 private String bucket_mediafiles;
 @Value("${minio.bucket.videofiles}")
 private String bucket_video;
 @Override
 public UploadFileResultDto uploadFile(Long companyId, UploadFileParamsDto uploadFileParamsDto, String localFilePath,String objectName) {
   //文件名
  String filename=uploadFileParamsDto.getFilename();
  //得到扩展名
  String extension=filename.substring(filename.lastIndexOf("."));
  //得到mimeType
  String mimeType=getMimeType(extension);
  //子目录
  String defaultFolderPath = getDefaultFolderPath();
  //获得文件的MD5值
  String fileMd5 = getFileMd5(new File(localFilePath));
  if(StringUtil.isEmpty(objectName)){
   objectName=defaultFolderPath+fileMd5+extension;
  }
  boolean result = addMediaFilesToMinIO(localFilePath, mimeType, bucket_mediafiles, objectName);
  if(!result){
   XueChengPlusException.cast("上传文件失败");
  }

  //将文件信息存储到数据库
  MediaFiles mediaFiles = mediaFileService.addMediaFilesToDb(companyId, fileMd5, uploadFileParamsDto, bucket_mediafiles, objectName);
  if(mediaFiles==null){
   XueChengPlusException.cast("文件上传后保存信息失败");
  }
  //准备返回数据
  UploadFileResultDto uploadFileResultDto = new UploadFileResultDto();
  BeanUtils.copyProperties(mediaFiles, uploadFileResultDto);
  return uploadFileResultDto;
 }
//得到分块文件的目录
 private String getChunkFileFolderPath(String fileMd5){
  return fileMd5.substring(0,1)+"/"+fileMd5.substring(1,2)+"/"+fileMd5+"/"+"chunk"+"/";
 }
 @Override
 public RestResponse<Boolean> checkChunk(String fileMd5, int chunkIndex) {
  //分块存储的路径，md5前两位为两个目录，chunk存储分块文件
  //根据MD5得到分块文件的路径
  String chunkFileFolderPath = getChunkFileFolderPath(fileMd5);
  //如果数据库存在再查询minio
  GetObjectArgs getObjectArgs = GetObjectArgs.builder()
          .bucket(bucket_video)
          .object(chunkFileFolderPath+chunkIndex)
          .build();
  //查询远程服务获取到一个流对象
  try{
   GetObjectResponse inputStream = minioClient.getObject(getObjectArgs);
   if(inputStream!=null){
    return RestResponse.success(true);
   }
  } catch (Exception e){
   e.printStackTrace();
  }
  return RestResponse.success(false);
 }

 @Override
 public RestResponse<Boolean> checkFile(String fileMd5) {
  MediaFiles mediaFiles = mediaFilesMapper.selectById(fileMd5);
  if(mediaFiles!=null){
   String bucket = mediaFiles.getBucket();
   String filePath = mediaFiles.getFilePath();
   //如果数据库存在再查询minio
   GetObjectArgs getObjectArgs = GetObjectArgs.builder()
           .bucket(bucket)
           .object(filePath)
           .build();
   //查询远程服务获取到一个流对象
   try{
    GetObjectResponse inputStream = minioClient.getObject(getObjectArgs);
    if(inputStream!=null){
     return RestResponse.success(true);
    }
   } catch (Exception e){
    e.printStackTrace();
   }
  }
  return RestResponse.success(false);
 }

 @Override
 public RestResponse uploadChunk(String fileMd5, int chunk, String localChunkFilePath) {
  //分块文件的路径
  String chunkFileFolderPath = getChunkFileFolderPath(fileMd5)+chunk;
  //获取mimeType
  String mimeType = getMimeType(null);
  //将分块文件上传到minio
  boolean b = addMediaFilesToMinIO(localChunkFilePath, mimeType, bucket_video, chunkFileFolderPath);
  if(!b){
   return RestResponse.validfail(false,"上传分块文件失败");
  }
  return RestResponse.success(true);
 }

 @Override
 public RestResponse mergechunks(Long companyId, String fileMd5, int chunkTotal, UploadFileParamsDto uploadFileParamsDto) {
  //分块文件所在目录
  String chunkFileFolderPath = getChunkFileFolderPath(fileMd5);
  //找到所有的分块文件
  List<ComposeSource> sources = Stream.iterate(0, i -> ++i).limit(chunkTotal).map(i -> ComposeSource.builder().bucket(bucket_video).object(chunkFileFolderPath + i).build()).collect(Collectors.toList());
  //源文件名称
  String filename = uploadFileParamsDto.getFilename();
  //扩展名
  String extension = filename.substring(filename.lastIndexOf("."));
  //合并后文件的objectname
  String objectName = getFilePathByMd5(fileMd5, extension);
  //指定合并后的objectName等信息
  ComposeObjectArgs composeObjectArgs = ComposeObjectArgs.builder()
          .bucket(bucket_video)
          .object(objectName)//合并后的文件的objectname
          .sources(sources)//指定源文件
          .build();
  //===========合并文件============
  //报错size 1048576 must be greater than 5242880，minio默认的分块文件大小为5M
  try {
   minioClient.composeObject(composeObjectArgs);
  } catch (Exception e) {
   e.printStackTrace();
   log.error("合并文件出错,bucket:{},objectName:{},错误信息:{}",bucket_video,objectName,e.getMessage());
   return RestResponse.validfail(false,"合并文件异常");
  }
  //===========校验合并后的和源文件是否一致，视频上传才成功===========
  //先下载合并后的文件
  File file = downloadFileFromMinIO(bucket_video, objectName);
  try(FileInputStream fileInputStream = new FileInputStream(file)){
   //计算合并后文件的md5
   String mergeFile_md5 = DigestUtils.md5Hex(fileInputStream);
   //比较原始md5和合并后文件的md5
   if(!fileMd5.equals(mergeFile_md5)){
    log.error("校验合并文件md5值不一致,原始文件:{},合并文件:{}",fileMd5,mergeFile_md5);
    return RestResponse.validfail(false,"文件校验失败");
   }
   //文件大小
   uploadFileParamsDto.setFileSize(file.length());
  }catch (Exception e) {
   return RestResponse.validfail(false,"文件校验失败");
  }

  //==============将文件信息入库============
  MediaFiles mediaFiles = mediaFileService.addMediaFilesToDb(companyId, fileMd5, uploadFileParamsDto, bucket_video, objectName);
  if(mediaFiles == null){
   return RestResponse.validfail(false,"文件入库失败");
  }
  //==========清理分块文件=========
  clearChunkFiles(chunkFileFolderPath,chunkTotal);


  return RestResponse.success(true);
 }


}
